Github user rxin commented on the issue:
https://github.com/apache/spark/pull/19973
The issue is in
```
/**
* Return the `string` value of Spark SQL configuration property for the
given key. If the key is
* not set yet, return `defaultValue`.
*/
def getConfString(key: String, defaultValue: String): String = {
if (defaultValue != null && defaultValue != "<undefined>") {
val entry = sqlConfEntries.get(key)
if (entry != null) {
// Only verify configs in the SQLConf object
entry.valueConverter(defaultValue)
}
}
Option(settings.get(key)).getOrElse(defaultValue)
}
```
The value converter gets applied on this generated string which is not a
real value and will fail.
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